Get the GM diff fluid with the friction modifier included.Curious on the interval and what fluid you use to change? I've never changed rear end fluid in my car since I've owned it and really only once or twice ever on any vehicle I've owned, and that was only because I was swapping diffs for a posi. unit. I've had a couple GM trucks with well over 200k miles without any diff. service, but of course those never saw a ton of power and abuse like the V does. My 8.8's in a few vehicles saw quite a bit more abuse and power and still never cared much for fluid changes, still going strong, no whining or anything funny. What is with GM and these Diffs!? LOL. Before I got my V, the dealer installed a new diff., however, claimed it was only for pinion shaft seal.
But anyways for fluid, what do you normally use? And any additives/friction modifiers?
